STM32定时器捕获测不同频率相位差hal库

使用STM32的定时器捕获功能可以测量不同频率的信号相位差，使用HAL库可以更加方便快捷地实现。下面是一个简单的步骤：

1. 初始化定时器，选择计数模式为捕获模式

htim2.Instance = TIM2;
htim2.Init.Prescaler = 0;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 0xFFFF;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&htim2);

2. 配置捕获通道，选择捕获模式为上升沿或下降沿，以及使能捕获中断

TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_IC_InitTypeDef sConfigIC = {0};

sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig);

sConfigIC.ICPolarity = TIM_ICPOLARITY_RISING;
sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
sConfigIC.ICFilter = 0;
HAL_TIM_IC_ConfigChannel(&htim2, &sConfigIC, TIM_CHANNEL_1);

sConfigIC.ICPolarity = TIM_ICPOLARITY_FALLING;
sConfigIC.ICSelection = TIM_ICSELECTION_INDIRECTTI;
HAL_TIM_IC_ConfigChannel(&htim2, &sConfigIC, TIM_CHANNEL_2);

sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig);

HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1);
HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_2);

3. 在捕获中断回调函数中，获取捕获到的计数值，并计算相位差

void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
    static uint32_t lastCapture = 0;
    static uint32_t thisCapture = 0;
    static uint32_t phaseDiff = 0;
    
    if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
    {
        thisCapture = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
        phaseDiff = thisCapture - lastCapture;
        lastCapture = thisCapture;
    }
    else if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
    {
        thisCapture = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
        phaseDiff = lastCapture - thisCapture;
        lastCapture = thisCapture;
    }
}

这样就可以通过计算捕获到的相位差来测量不同频率信号的相位差了。